X-Git-Url: https://git.ralfj.de/rust-101.git/blobdiff_plain/2d40516a8393db1f27bb822ff95c71a1a9c82537..ab7f9b241429bd675b437d2437799de75d2f409b:/workspace/src/part09.rs

diff --git a/workspace/src/part09.rs b/workspace/src/part09.rs
deleted file mode 100644
index 61cc70b..0000000
--- a/workspace/src/part09.rs
+++ /dev/null
@@ -1,85 +0,0 @@
-// Rust-101, Part 09: Iterators
-// ============================
-
-use part05::BigInt;
-
-
-pub struct Iter<'a> {
-    num: &'a BigInt,
-    idx: usize, // the index of the last number that was returned
-}
-
-// Now we are equipped to implement `Iterator` for `Iter`.
-impl<'a> Iterator for Iter<'a> {
-    // We choose the type of things that we iterate over to be the type of digits, i.e., `u64`.
-    type Item = u64;
-
-    fn next(&mut self) -> Option<u64> {
-        // First, check whether there's any more digits to return.
-        if self.idx == 0 {
-            // We already returned all the digits, nothing to do.
-            unimplemented!()
-        } else {
-            // Otherwise: Decrement, and return next digit.
-            unimplemented!()
-        }
-    }
-}
-
-// All we need now is a function that creates such an iterator for a given `BigInt`.
-impl BigInt {
-    fn iter(&self) -> Iter {
-        unimplemented!()
-    }
-}
-
-// We are finally ready to iterate! Remember to edit `main.rs` to run this function.
-pub fn main() {
-    let b = BigInt::new(1 << 63) + BigInt::new(1 << 16) + BigInt::new(1 << 63);
-    for digit in b.iter() {
-        println!("{}", digit);
-    }
-}
-
-// Of course, we don't have to use `for` to apply the iterator. We can also explicitly call `next`.
-fn print_digits_v1(b: &BigInt) {
-    let mut iter = b.iter();
-    loop {
-        // Each time we go through the loop, we analyze the next element presented by the iterator - until it stops.
-        unimplemented!()
-    }
-}
-
-fn print_digits_v2(b: &BigInt) {
-    let mut iter = b.iter();
-    while let Some(digit) = iter.next() {
-        println!("{}", digit)
-    }
-}
-
-// **Exercise 09.1**: Write a testcase for the iterator, making sure it yields the corrects numbers.
-// 
-// **Exercise 09.2**: Write a function `iter_ldf` that iterators over the digits with the least-significant
-// digits coming first. Write a testcase for it.
-
-// ## Iterator invalidation and lifetimes
-
-fn iter_invalidation_demo() {
-    let mut b = BigInt::new(1 << 63) + BigInt::new(1 << 16) + BigInt::new(1 << 63);
-    for digit in b.iter() {
-        println!("{}", digit);
-        /*b = b + BigInt::new(1);*/                                 /* BAD! */
-    }
-}
-
-// ## Iterator conversion trait
-
-impl<'a> IntoIterator for &'a BigInt {
-    type Item = u64;
-    type IntoIter = Iter<'a>;
-    fn into_iter(self) -> Iter<'a> {
-        self.iter()
-    }
-}
-// With this in place, you can now replace `b.iter()` in `main` by `&b`. Go ahead and try it! <br/>
-